linux-kernel - Re: [Question] sched: migrate RT task on throttled leaf RT runqueue?

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Date:	Thu, 14 Jul 2011 10:09:12 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Hillf Danton <dhillf@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Question] sched: migrate RT task on throttled leaf RT
 runqueue?

On Thu, 2011-07-14 at 21:43 +0800, Hillf Danton wrote:
> Hi Steven
> 
> When a non-boosted RT task is enqueued, if it is attached to task group, as
> shown in the following diff format for clarity, and even if the RT runqueue
> owned by the task group is throttled, the rt_rq is loaded up as leaf and the
> task is added to pushable list if it is pushable.
> 
> Since RT tasks on throttled rt_runqueue will not be picked to be the next task
> when scheduling, could they be migrated by pushing and pulling?

Note, run queues are not throttled, groups are. And tasks on a throttled
group should not be touched by the push/pull algorithm.

-- Steve

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